Reader Ephraim Heller has sent some lovely photos of humpback whales, including their recently-discovered and amazing behavior of bubble-netting.  His captions and IDs are indented, and you can enlarge the photos by clicking on them.

Pacific herring (Clupea pallasii) spend most of the year dispersed across the open North Pacific, but each spring they converge on Sitka Sound to spawn. The 2026 spawning biomass was estimated at roughly 233,000 tons of mature herring. This attracts commercial fishermen, fishing birds, Steller sea lions, gray whales, humpback whales (Megaptera novaeangliae), and… me.

Here’s a humpback whale jumping for joy:

And here is Sitka Sound, with Mount Edgecumbe (a dormant volcano) in the background:

The scientific name of humpback whales is Megaptera novaeangliae, meaning “big-winged of New England,” due to their oversized pectoral flippers and first observations off of New England. These flippers increase their agility and enable their unique behavior: bubble-net feeding. Here are views of the baleen:

Bubble-net feeding is not a fixed behavioral pattern; it is a culturally transmitted skill, and not every humpback population practices it. The behavior has been documented extensively in Southeast Alaska, and a long-term study published in January 2026 in Proceedings of the Royal Society B tracked its spread in the Kitimat Fjord System of northern British Columbia over a 20-year period (2004–2023). Of 526 individually identified whales, roughly half were observed bubble-net feeding at least once, with more than 92% of those events occurring in a group context:

The behavior gained momentum after the 2014-2016 marine heat wave (“the blob”) that reduced prey availability across the northeastern Pacific. Researchers interpret this as whales adopting a more efficient foraging strategy in response to environmental stress, and transmitting that knowledge through their social networks:

The hunt begins when a group of humpbacks locates a school of small prey — herring, krill, or juvenile salmon. One whale, often referred to as the “bubble-blower,” dives beneath the school and begins exhaling air through its blowhole while swimming in a tightening upward spiral. The released air rises as a cylindrical curtain of bubbles. Fish do not readily cross this curtain, so as the spiral contracts, the school is compressed into an increasingly dense ball:

Meanwhile, one or more other whales in the group produce “food call” vocalizations: loud, frequency-modulated cries that vibrate the swim bladders of herring, causing them to clump even more tightly together. The calls also appear to serve a coordinating function among the whales themselves, signaling when to begin the final ascent. I could occasionally hear the food calls on the deck of my observation boat:

When the prey is sufficiently concentrated, the group orients below the net and lunges upward in near-unison, mouths agape, through the center of the bubble column. At the surface, each whale engulfs thousands of fish in a single pass, then strains the water out through its baleen plates as it rolls and closes its jaws. Groups involved in a single feeding event can range from two to around 16 individuals (according to the literature), each surfacing in roughly the same position relative to the others on every lunge. It’s hard to tell exactly how many bubble-netters are in this photo, but I think it is more than 16:

Quantitative work using drone footage and bio-logging tags has found that solitary humpbacks actively adjust the number of bubble rings, net diameter, and the spacing between individual bubbles from one dive to the next. This level of fine-tuning (“manufacturing” a tool and modifying it based on conditions) contributed to a 2024 study’s argument that bubble nets qualify as tools under standard definitions. On average, a well-constructed net can increase the prey density available in a single lunge by roughly sevenfold, without measurably increasing the whale’s energetic expenditure:

No other baleen whale species does this, and biomechanics research suggests morphology is the reason. A 2025 study comparing turning performance across seven mysticete species found that bubble-net feeding humpbacks achieved centripetal accelerations that exceeded the upper limits recorded in comparable maneuvers by all six other species tested. The humpback’s large pectoral flippers generate substantial lift, which helps the animal bank inward tightly and decrease its turning radius enough to close a spiral into a true net. Other whale species, even if they could theoretically attempt the maneuver, would likely burn too much energy to make the strategy worthwhile:

My next post will include photos of other animals that come to Sitka sound to enjoy the herring feast.

Send ’em in if you got ’em.  The photo situation is dire.

But today we have whale photos by reader Ephriam Heller. His captions and IDs are indented, and you can enlarge his photos by clicking on them.

The best whale watching I have experienced is observing gray whales (Eschrichtius robustus) in the San Ignacio Lagoon on the Pacific coast of the Baja peninsula in Mexico. These whales are curious and “friendly,” often swimming up to boats to observe their occupants and even allowing themselves to be touched. Here is an example of an interaction between two species that each appear to exhibit curiosity and intelligence:

This is what a gray whale looks like (Image courtesy of International Whaling Commission):

They engage in numerous photogenic behaviors, such as rolling, riding the surf, waving their flippers and flukes in the air, and spyhopping to observe their surroundings.

The gray whale has longitudinal double blowholes. People claim that they form a heart shape, but think a heart with this shape needs immediate treatment:

When the sunlight hits their spray just right, one sees “rainblows”:

The gray whale has the most parasites of any whale, carrying up to 180 kg. At birth, babies have no barnacles or sea lice, but quickly acquire them from their mothers. The older the whale, the more barnacles and lice they collect. The whales rub along the seabed and piers to try to rid themselves of the parasites.

The whales carry one species of barnacle and four species of whale lice. The barnacles are Cryptolepas rhachianecti (whale barnacles) which are specific to gray whale hosts (i.e., they rarely occur on any other species), and they die when the whale dies.

There are four species of “whale lice,” which are not true lice (which are insects) but are amphipods in family Cyamidae: Cyamus scammony (the most common), Cyamus kessleri, and Cyamus eschrichtii are all found only on gray whales. Cyamus ceti is found on gray and bowhead whales. These cause minor irritation to healthy whales. Researchers view cyamid coverage and distribution (e.g., heavy clusters near blowhole, mouthline, genital slit) as indicators of stress, nutritional status, and chronic skin disease rather than as a primary cause of these problems.

There are two populations. The larger Eastern North Pacific population migrates along the continental coast between its breeding grounds in Baja, Mexico and its feeding grounds in Alaska. The small Western North Pacific population migrates along the Pacific coast of Asia. Gray whales hold the record for the longest migration of any mammal, with typical round-trip distances of about 20,000 km annually (although this isn’t close to the 70,000 km migration of the arctic tern).

Whales fall into two suborders: baleen (Mysticeti) and toothed (Odontoceti). Gray whales are in Mysticeti and use their baleen to feed on amphipods and plankton on the seafloor. During the six month summer feeding season, adults consume over 1 ton of food per day. They then fast for the remainder of the year, including the migration and winter birthing / breeding season. They exhibit “handedness,” in that most gray whales feed by scooping up sediments from the seafloor with the right side of their heads, resulting in their right sides having fewer adhering barnacles and sea lice.

They live up to ~70 years. Biggs transient killer whales (orcas) kill up to 35% of the calf population annually. Based on scarring, researchers speculate that almost every gray whale has been attacked by orcas. Most attacks occur as the young calves migrate north through Monterey Bay, California and Unimak Pass, Alaska.

The Eastern North Pacific population dropped to ~1,000 individuals around 1885 due to whaling, but has since recovered to ~27,000 in 2015-2016. The Western North Pacific population is tiny, comprising just a few hundred individuals. North Atlantic populations were extirpated (perhaps by whaling at the end of the medieval warm period) on the European coast in the 12th to 14th centuries, and on the American and African Atlantic coasts around the late 17th to early 18th centuries. Remains of gray whales from the time of the Roman empire have been found in the Mediterranean Sea, and they are still rarely seen there in modern times.

The gray whale has a dark slate-gray color and is covered by characteristic gray-white patterns, which are scars left by parasites that drop off in its cold feeding grounds. Individuals can be identified by their pigmentation patterns and their scars. I got this great photo of a whale’s tail; but it was just a fluke:

In case you are the kind of person who is interested in this sort of thing, this is what it looks like when whales mate:

Anyone with a younger brother will recognize this as the “head butt” greeting, a conserved behavior across all mammal species:

And this is the view when you saddle up a gray whale (I use a western saddle):

The eyes of gray whales are unlike the eyes of any other mammal I have seen, with what appear to be tangled filaments. My AI friend assures me that this is not the case and that they do not have any “extra” organs in their eyes: “The ‘tangled filaments’ you’re seeing are structures in the gray whale’s iris and surrounding tissues that become visible because the eye is small, very dark, and strongly three‑dimensional, so you are effectively looking across folded, ridged iris and ciliary tissues rather than through a flat, open pupil as in most mammals you see up close.”